白健华,高尚,邹剑,王子权,张璐,潘定成,敬季昀
Bai Jianhua,Gao Shang,Zou Jian,Wang Ziquan,Zhang Lu,Pan Dingcheng,Jing Jiyun

• 1:中海石油(中国)有限公司天津分公司

摘要(Abstract)：

渤海垦利A油田沙河街组具有岩性分布复杂、横向连通性差、纵向薄互层发育等特征，投产后产能递减快，常规解堵增产效果不佳，亟需开展酸化改造工艺研究。通过开展岩心室内实验，明确储层岩矿特征，进一步剖析常规解堵效果差的原因，基于此研发了配套体系并优化工艺参数，形成混积岩储层酸化改造体系及配套工艺。结果表明：混积岩表现为高钙质、高黏土、高石英、高铁矿4类复杂岩性特征，储层孔隙虽发育但连通性差，常规解堵体系难以有效改造且容易产生二次伤害；研发了蚀孔液体系，借助其螯合作用，减少二次伤害同时能够实现深部溶蚀，形成酸蚀大孔道，稳定铁离子能力达到428 mg/g，岩心渗透率恢复率为293%；优化得到施工排量为0.2～0.5 m~3/min时，增产倍比高达1.95～1.99。现场应用结果表明，解堵后平均单井日增油量超20 m~3，阶段累计增油量超8 000 m~3。研究成果填补了海上混积岩储层增产改造技术空白，为渤海垦利A油田规模有效开发提供技术保障。
Kenli A oilfield in Bohai Sea has complex lithology distribution, poor lateral connectivity, and vertically developed thin interbeds in Shahejie Formation. After production, the productivity decreased rapidly and conventional method for plugging removal and production increase is not effective, so it is urgent to carry out the research on acidizing stimulation techniques. Indoor experiments are conducted through coring. The rock and mineral characteristics of reservoir are clarified, and the reason for poor conventional plugging removal effect is further analyzed to develop supporting system and optimize process parameters, forming an acidizing stimulation system and supporting techniques for hybrid sediments reservoirs. The results show that, hybrid sedimentary rocks are characterized by 4 types of complex lithologies, including high calcium, high clay, high quartz and high iron ore. Although reservoirs develop pores, poor connectivity limits the stimulation effect of conventional plugging removal system, often causing secondary damage. Therefore, an etching fluid system is developed, which reduces the secondary damage through chelation while enabling deep dissolution to form a large acid-erching pore channel, with iron stabilization capacity up to 428 mg/g and core permeability recovery of 293%. The optimized construction displacement is 0.2～0.5 m~3/min, with production increasing ratio up to 1.95～1.99. Field application shows that average daily oil production increase of single well exceeds 20 m ~3 after plugging removal, with the staged cumulative incremental oil production exceeding 8 000 m~3. The research fills the technological gap in offshore hybrid sedimentary reservoirs production increase and stimulation, providing a technical guarantee for effective development of the Kenli A oilfield scale.

关键词(KeyWords)： 混积岩;储层特征;酸化改造;蚀孔液;岩心流动实验;渤海油田
hybrid sedimentary rocks;reservoir characterization;acid stimulation;etching fluid;core flow experiment;Bohai Oilfield

Abstract:

Keywords:

基金项目(Foundation): “十四五”国家科技重大项目“海上高含水油田提高注采效率关键采油工艺技术”（KJGG2021-0502）

作者(Author): 白健华,高尚,邹剑,王子权,张璐,潘定成,敬季昀
Bai Jianhua,Gao Shang,Zou Jian,Wang Ziquan,Zhang Lu,Pan Dingcheng,Jing Jiyun

DOI: 10.19597/J.ISSN.1000-3754.202505026

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